JP2011203478A - Piano type action - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an upright piano type action and a grand piano type action, by which performance with weak sound is effectively played without spoiling touch feeling.SOLUTION: The piano type action includes: a position switching mechanism 200 connected to a support rail (a hammer rail 100); and a key load mechanism 300 provided for each key. The position switching mechanism 200 includes: an operation section 210 mounted on a piano body; and a driving section 251 connected to the operation section and the support rail, which displaces the support rail to a hitting direction on the basis of operation of the operation section. The key load mechanism 300 includes an elastic member 320 which makes a key act on an elastic force to a non-key depressing position, and a support section (a shaft support section 310) which is supported by the action or an action neighboring member so as to resist elastic reaction force by supporting the elastic member. The grand piano type action including the same mechanism is also provided.

Description

  The present invention relates to a piano-type action, that is, an upright piano action including an upright piano action and the same type of action, and a grand piano action including a grand piano action and the same type of action.

  Many electronic keyboard instruments that emit a sound similar to a piano (acoustic piano) are commercially available, and are often used as substitutes for pianos. The sound quality is becoming very close to that of the piano by repeated improvements. As a result, not only the sound quality but also the action that is close to the piano has been demanded.

  Therefore, it is conceivable to use an upright piano action or a grand piano action as an electronic keyboard instrument. However, there is the following problem in the possibility of playing with weak sounds.

  The conventional upright piano has a structure in which the distance between the hammer and the string is reduced by moving the hammer rail that supports the hammer when the key is not pressed to the string side. Thus, by shortening the distance that the hammer is accelerated when the key is pressed, the string striking force is weakened and the sound is weakened. However, if the hammer rail is moved largely to the string side, the hammer assembly rotates in the same direction, the bridal tape pulls up the wipen, and a gap (empty (between the capstan button on the key and the wipen heel) Color)), and the load on the key is released. As a result, the capstan button side of the key is lifted, and the keys are not aligned. For this reason, the movement amount of the hammer rail has to be small.

  Further, since the bat rotates together with the hammer toward the string side by the amount of movement of the hammer rail, the gap with the jack tip is increased. As a result, until the jack reaches the bat when the key is pressed, the “empty” state in which the key pressing resistance is extremely low continues and the touch feeling is greatly impaired. In order to prevent this “empty” state, a structure has been proposed in which the back rail that supports the rear end of the key (the side closer to the string) from below is raised when the hammer rail is moved (Patent Document 1). However, in this structure, the key rotates so as to sink the front side (player side) simultaneously with the rise of the back rail. As a result, the key depression depth is reduced accordingly, and the touch feeling changes from normal.

  The weak sound performance on the grand piano is performed so that the hammer strikes only two strings against the three strings stretched for one key by shifting the action left and right of the instrument. However, since the kinetic energy of the hammer given to the strings does not change, no significant attenuation can be obtained. In addition, it is impossible to attenuate sound in a winding portion in which two or one is stretched for one key.

  For this reason, there has been a problem that the use of a piano action as an electronic keyboard instrument and the ability to play a weak sound have a limitation in sound attenuation, and a good touch feeling cannot be obtained.

  On the other hand, if the action of the upright piano and the grand piano can be performed with a weaker sound with a good touch, it is suitable to meet the demands for more diverse performance forms and consideration of the surrounding environment. Can provide a good piano.

Japanese Utility Model Publication No. 62-71690

  Therefore, an object of the present invention is to provide an upright piano type action and a grand piano type action that can perform a performance with a weak sound effectively without impairing the touch feeling.

  In order to achieve the above object, the present invention provides an upright piano type action in which a swing member held by a support rail when not pressed is rotated in the hitting direction in conjunction with the key press. A position switching mechanism coupled to each other; and a key load mechanism provided for each key. The position switching mechanism is coupled to the operation unit mounted on the piano body, the operation unit, and the support rail. A drive unit that displaces the support rail in the hitting direction based on the operation of the key, and the key load mechanism supports an elastic member that applies an elastic force to the key toward the non-pressed position, and the elastic member. There is provided an upright piano type action characterized by including an action or a support portion supported by a member adjacent to the action so as to resist an elastic reaction force.

  According to another aspect of the present invention, in order to achieve the above object, in the grand piano type action in which the rocking member held by the repetition lever is rotated in the hitting direction in conjunction with the key depression when the key is not depressed, A position switching mechanism for switching the position of each of the keys, and a key load mechanism provided for each key. The position switching mechanism is connected to the operation unit attached to the piano body and contacts the swing member. And a drive unit that displaces the swinging member in the hitting direction based on an operation of the operation unit, and the key load mechanism applies an elastic force directed to the non-key-pressing position to the repetition lever flange or the key. A ground peer comprising: an elastic member; and a support portion supported by an action or a neighboring member of the action so as to support the elastic member and resist an elastic reaction force It is to provide a type action.

  The upright piano type action according to the present invention has a structure in which the swinging member held by the support rail when the key is not pressed rotates in the hitting direction in conjunction with the key press, and is coupled to the support rail. And a key load mechanism that is provided for each key and applies an elastic force to the key toward the non-key-pressed position. The position switching mechanism includes an operation unit attached to the piano main body, and a drive unit coupled to the operation unit and the support rail to displace the support rail in the hitting direction based on the operation of the operation unit. ing. Therefore, by operating the drive unit by the operation unit to displace the support rail in the hitting direction, the hitting distance when the key is not pressed is shortened, and the sound is weakened when the key is pressed. The key loading mechanism is supported by an action member or an adjacent member of the action so as to support the elastic member and resist the elastic reaction force, and an elastic member that applies an elastic force to the key toward the non-key-pressing position. And a support part. Therefore, even if the support rail is displaced in the hitting direction by the position switching mechanism and the gap between the bat and the jack tip becomes large, the elastic member of the key load mechanism gives the key pressing resistance to the key. As a result, the occurrence of an “empty” state in which the key pressing resistance is extremely small is avoided, and a good touch feeling is ensured. In addition, even if the drive unit of the operation unit displaces the support rail in the hitting direction and the swinging member accompanying the displacement displaces in the same direction to release the load on the key, the key is not removed from the elastic member. Since it receives an elastic force toward the key pressing position, it does not lift from the non-key pressing position and maintains an accurate arrangement.

  The grand piano type action according to the present invention has a structure in which the swinging member held by the repetition lever rotates in the hitting direction in conjunction with the key pressing when the key is not pressed, and is coupled to the swinging member. A position switching mechanism and a key load mechanism provided for each key. The position switching mechanism includes an operation unit mounted on the piano body, and a drive coupled to the operation unit that contacts the swing member and displaces the swing member in the hitting direction based on the operation of the operation unit. Department. Therefore, by operating the drive unit by the operation unit and displacing the swinging member in the hitting direction, the hitting distance when the key is not pressed is shortened, and the sound is weakened when the key is pressed. The key load mechanism includes an elastic member that applies an elastic force toward the non-pressing position to the repetition lever flange or the key, and an action or an adjacent member of the action so as to support the elastic member and resist an elastic reaction force. And a support portion supported by the. Therefore, even if the swinging member is displaced in the hitting direction by the position switching mechanism and the distance from the jack is increased, the repetition lever flange or key on which the elastic member of the key load mechanism acts is contrary to the operation associated with the key depression. An elastic force is received in the direction, and the key receives a key pressing resistance. As a result, the occurrence of an “empty” state in which the key pressing resistance is extremely small is avoided, and a good touch feeling is ensured.

  As described above, according to the present invention, it is possible to provide an upright piano type action and a grand piano type action capable of performing a performance with a weak sound effectively without impairing the touch feeling.

It is a vertical side view which shows one Embodiment of the upright piano type | mold action which concerns on this invention with a keyboard. It is a vertical side view which takes out and shows a part of upright piano type | mold action shown in FIG. It is a vertical side view which shows one Embodiment of the grand piano type action which concerns on this invention with a keyboard. It is a vertical side view which takes out and shows a part of grand piano-type action shown in FIG. FIG. 4 is a perspective view mainly showing a position switching mechanism and a key load mechanism in the grand piano type action shown in FIG. 3. It is a side view which shows the change aspect of the position switching mechanism in the grand piano type action shown in FIG. It is a side view which shows the change aspect of the key load mechanism in the grand piano type action shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Hereinafter, the player side in the piano and action will be referred to as the front side, and the side far from the player will be referred to as the rear side.

  FIG. 1 is a side view showing an upright piano type action according to an embodiment of the present invention together with a keyboard, and FIG. 2 is a longitudinal side view showing a part of the action of FIG. In these drawings, one key closer to a high tone in the action is extracted and shown. Further, the state before the operation for the weak sound performance is indicated by a solid line, and the state after the operation is indicated by a broken line.

  The illustrated action is for an upright piano, which is an acoustic piano. The hammer strikes the string S, and the vibration of the string is transmitted to the soundboard to produce a musical sound. When the action is for an upright type electronic piano, the string S is replaced with a stopper member such as a metal plate, and the hammer and the hammer shank are replaced with a swing member that hits the stopper member. The swing member is supported by rails similar to the hammer rail, and these rails are collectively referred to as a support rail. Sound generation is performed by detecting the rotational speed of the swinging member immediately before the hit and the magnitude corresponding to the speed.

  In the following, the present invention will be described based on an example of an action for an upright piano shown in the drawing. This action has the normal basic form described below. The state when no key is pressed will be described. A center rail 20 extending in the frontage direction of the entire action is supported by the bracket 10 at both ends, and a Uipen flange 31 is attached to the lower portion of the center rail 20 for each key, via its shaft 31a, The wiper 30 is supported rotatably. The vipen 30 is supported near the rear end by the vipen flange 31 and extends substantially horizontally. A wipen heel 32 hangs down from the lower front side of the wipen 30, and a capstan button C provided near the rear end of the key rises when the key is depressed to push up the wipen heel 32 and rotate the wipen 30 upward. Let

  A jack 40 is rotatably coupled via a jack flange 41 slightly ahead of the central portion of the wiper 30. The jack 40 is composed of a long piece 42 and a short piece 43 and has an L shape in side view. The long piece 42 is inclined slightly rearward and extends upward, and is in contact with the bat 5. The short piece 43 extends forward from the lower end of the long piece 42, and the compression coil spring 33 inserted between the short piece 43 and the wiper 30 pushes the short piece 43 upward and attaches the jack 40 to rotate. It is fast.

  A bat 5 is attached to the upper portion of the center rail 20 for each key. The bat 5 includes a butt flange 51 and a bat body 50 that is rotatably supported by the butt flange 51. A hammer shank 71 extends from the upper part of the bat main body 50, and a hammer 70 is coupled to the tip thereof. A catcher 52 that is restricted from returning after stringing is coupled to the front portion of the bat main body 50 via a catcher shank 53.

  A back check 60 is attached near the front end of the wiper 30 by a back check wire 61 extending upward. The back check 60 functions to restrict the hammer 70 that has struck the string from returning to the front due to the repulsive force.

  A damper lever 80 is rotatably supported at the upper end of the center rail 20 via a damper lever flange 81 extending rearward for each key. A damper felt 83 is coupled to the damper lever 80 via a damper wire 82 and the like extending upward. As the damper lever 80 rotates, the damper felt 83 moves away from the string when the key is pressed and touches the string when the key is released to suppress the vibration.

  A regulating rail 91 extends in the direction of the frontage of the entire action so as to be separated from the center in the height direction of the center rail 20 and is centered by the regulating brackets 92 spaced from each other in the same frontage direction. It is coupled to the rail 20. For each key, a regulating screw 93 is screwed into the regulating rail 91 in the vertical direction, and a regulating button 90 is fixed to the lower part thereof. The regulating button 90 abuts on the short piece 43 of the jack while the jack 40 is raised when the key is depressed, and has a function of rotating the jack 40 forward.

  The hammer rails 100 are supported on the left and right brackets 10 by hammer rail hinges 101. In the non-key-pressed state, the hammer shank 71 is supported on the hammer rail 100 while being inclined rearward.

  A hammer rail felt 102 is bonded to the hammer rail 100 on the surface of the hammer shank, and an engagement piece 103 is attached to the opposite side. The hammer rail 100 is located immediately in front of the hammer shank 71 (player side) in a non-key-pressed state, and the hammer rail felt 102 is in contact with and supported by the hammer shank 71. In this state, the jack 40 has a tip closest to the bat main body 50, and minimizes a low-resistance initial key-pressing range (so-called empty) that is not subjected to a load greater than that of the wiper. A soft pedal push-up bar B extends upward from a pedal assembly (not shown), and its tip end engages with the engagement piece 103. When the performer steps on the soft pedal, the soft pedal push-up bar B rises, and the hammer rail 100 rotates to the string side via the engagement piece 103. The amount of rotation is small and limited as described above.

  This action operates as follows when a key is pressed. In the non-key-pressed state, the wipen 30 is at the lowest position, the jack 40 is positioned directly below the bat body 50, and the hammer 70 is inclined backward and supported by the hammer rail 100. As the key is pressed, the pen 30 is raised, and the jack 40 rotates the bat 50 and the hammer 70. As the jack 40 is pushed up to a position where the short piece 43 contacts the regulating button 100, the jack 40 is rotated forward and detached from the bat main body 50, and immediately after that, the key depression is in a full stroke state. This separation causes the hammer 70 to enter an escapement state that advances due to inertia, and strikes the string. After hitting the string, the hammer 70 is rapidly returned by the repulsive force of the string, the catcher 52 is received by the back check 80, and the return of the hammer 70 is stopped.

  The outline of the basic configuration of the action is as described above, and the description of the configuration not directly related to the function of the present invention is omitted.

  Next, a configuration that characterizes the present invention will be described. The upright piano type action shown in FIG. 1 includes a position switching mechanism 200 coupled to the hammer rail 100 and a key load mechanism 300 provided for each key.

  The position switching mechanism 200 includes an operation unit 210 attached to the piano body, and a drive unit 220 coupled to the operation unit and the hammer rail 100 to displace the hammer rail 100 in the hitting direction based on the operation of the operation unit 210. I have.

  The operation unit 210 includes an operation rod 211 supported by a guide member 213 extending along the shelf T supporting the action so as to be movable back and forth, and a knob attached to the operation rod and slightly protruding from the instrument body toward the player. Part 212, and a player can operate the knob part 212 back and forth. A small spherical projecting portion 211a is provided in the middle of the operation rod 211, and the guide member 213 is positioned at both ends of the guide path 213a through which the projecting section 211a passes slightly, and the projecting section 211a is loosened. A receiving portion 213b for receiving is formed, and a click feeling is given at the end portion of the operation portion 210 in the back-and-forth movement. The receiving part 213b is provided at a distance corresponding to the operating range of the driving part 220 described later.

  The drive unit 220 constitutes a link mechanism having one end coupled to the hammer rail 100. This link mechanism is pivotable by a shaft 222 to a drive rod 225 that is pivotally attached to the hammer rail hinge 101 and extends forward (performer side), and a support plate 221 that is attached to the shelf T. And a lever 223 supported by the motor. One member 223a of the lever 223 extends downward and is rotatably connected to the end of the operation rod 211 of the operation unit 210. The other member 223b of the lever 223 extends upward and is rotatably coupled to the front end portion of the drive rod 225.

  Therefore, when the knob 212 of the operation unit 210 is pulled in the direction of the arrow D1 (player side), the member 223a of the lever 223 rotates in the direction of the arrow D2 and the member 223b rotates in the direction of the arrow D3 (counterclockwise). As a result, the drive rod 225 is pushed to the string side, and the hammer rail 100 is rotated in the direction of the arrow D4 via the hammer rail hinge 101. As a result, the hammer shank 71 is pushed by the hammer rail felt 102 and becomes a position approaching the string side with the hammer 70.

  The key load mechanism 300 includes a leaf spring 320 as an elastic member that applies an elastic force to the key K toward the non-key pressing position. In this embodiment, the shaft support portion 310 of the lever 223 constitutes a support portion, and supports the base end portion of the leaf spring so as to resist the elastic reaction force of the leaf spring 320. Thereby, the front-end | tip part of the leaf | plate spring 320 is urged | biased in the direction which pushes down the upper surface of a key.

  This upright piano type action works as follows. During normal performance, the knob 212 is pushed into the shelf as shown in the figure. As a result, the hammer rail 100 and the hammer 70 are held at positions away from the string S by a normal distance. Next, at the time of performance with weak sounds, the knob 212 is pulled in the direction of the arrow D1. Thereby, the operation rod 211, the lever 223, and the drive rod 225 are actuated as described above, and the hammer rail 100 and the hammer 70 are positioned close to the string S. By performing string striking from this position, it is possible to perform with weak sounds.

  In this attenuated state, as a result of the bat body 50 being separated from the jack 40, the weight of the member such as the hammer 70 coupled to the bat body 50 does not act on the key pressing state, and the key pressing resistance is extremely small as it is. It becomes “empty”. On the other hand, in this embodiment, the leaf spring 320 (elastic member) of the key load mechanism 300 urges the key in the direction of pushing down the key. The

  Thus, in the upright piano type action according to the present embodiment, the hammer 70 starts to rotate from the position where the hammer rail 100 and the hammer 70 are moved by the position switching mechanism 200 and approached to the string S. Performance with weak sounds is performed effectively. At the same time, in the key load mechanism 300, while the jack 40 separated from the bat main body 50 reaches the bat main body 50 when the key is pressed, the leaf spring 320 (elastic member) gives a key pressing resistance, and the “empty” state is established. Because it avoids, touch feeling is not spoiled.

  When the drive unit 220 of the operation unit 210 displaces the hammer rail 100 in the stringing direction, the hammer 70 associated therewith is displaced in the same direction, and the bridal tape 55 pulls up the wipen 30 and the key capstan button. A gap (empty) is generated between C and the wipen heel 32, and the load on the key is released. However, since the key receives a spring force from the leaf spring 320 toward the non-key-pressing position, the key is maintained in an accurate arrangement without being lifted from the non-key-pressing position.

  As the position switching mechanism 200a, instead of the above link mechanism, as schematically shown in FIG. 1, a motor 251, a control mechanism 252 for rotating the motor at a predetermined angle, and a switch for operating the control mechanism 253. For example, the motor 251 can be connected to the shaft of the lever 223 to drive the lever 223 by a predetermined angle.

  FIG. 3 is a side view showing the grand piano type action according to the embodiment of the present invention together with the keyboard, and FIG. 4 is a longitudinal side view showing a part of the action of FIG. In these drawings, one key closer to a high tone in the action is extracted and shown. In addition, a state before operation for weak sound performance is indicated by a one-dot chain line, a state after operation is indicated by a solid line, and a state at the time of stringing is indicated by a broken line.

  The illustrated action is for a grand piano that is an acoustic piano. A hammer strikes the string S, and the vibration of the string is transmitted to the soundboard to produce a musical sound. In the case of a grand piano type electronic piano, the string S is replaced with a stopper member such as a metal plate, and the hammer and the hammer shank are replaced with a swing member that hits the stopper member. The swing member is supported by rails similar to the shank rails, and these rails are collectively referred to as support rails. Sound generation is performed by detecting the rotational speed of the swinging member immediately before the hit and the magnitude corresponding to the speed.

  Hereinafter, the present invention will be described based on an example of an action for a grand piano illustrated. This action has the normal basic form described below. The state when no key is pressed will be described. A support rail 1020 extending in the frontage direction of the entire action is supported by brackets 1010 at both ends. A support flange 1031 is attached to the support rail 1020 for each key, and a wiper 1030 is attached via the shaft 1031a. The rear end portion is rotatably supported and extends substantially horizontally. A wipen heel 1032 hangs down from the lower front side of the wipen 1030, and a capstan screw C provided near the end of the key rises when the key is depressed to push up the wipen heel 1032 and rotate the wipen 1030 upward. .

  A jack 1040 is rotatably coupled to the front end portion of the wiper 1030. The jack 1040 is composed of a long piece 1042 and a short piece 1043 and has an L shape in side view. The long piece 1042 is inclined slightly rearward and extends upward, and reaches the repetition lever 1050. The short piece 1043 extends forward from the lower end of the long piece 1042.

  A repetition lever 1050 is rotatably attached to the central portion of the pen 30 via a repetition lever flange 1051 and a center pin 1052 extending upward. The repetition lever 1050 is inclined such that the front is up and the back is down. An approximately L-shaped repetition spring 1054 is supported by the repetition lever flange 1051 at its corners and abuts both ends against the repetition lever 1050 and the wiper 1030 to urge the repetition lever 1050 in the aforementioned inclination direction. ing. The repetition lever 1050 maintains the tilted posture when the repetition lever button 1053 provided at the rear end abuts against the wiper 1030. The front portion of the repetition lever 1050 is bifurcated, and the upper end portion of the long piece 1042 of the jack 1040 enters the slit therebetween, and the tip thereof is located at substantially the same height as the repetition lever 1050.

  A shank rail 1100 extending in the frontage direction of the entire action is supported on the upper end of the front portion of the bracket 1010. A hammer shank 1071 is rotatably attached to the shank rail 1100 via a shank flange 1072, and a hammer 1070 is coupled to the tip thereof with the hammer felt 1072 facing upward. A hammer shank stop felt 1033 is provided at the rear end of the wiper 1030 and receives the hammer shank 1071 from below. A hammer roller 1074 is fixed to the lower surface of the base end portion of the hammer shank 1071. The hammer roller 1074 is lifted together with the hammer 1070 with the tip of the long piece 1042 of the jack 1040 coming into contact with the hammer roller 1074.

  A back check 1060 is attached to the rear end portion of the key K via a back check wire 1061. The back check 1060 has a function of restricting the hammer 1070 that has struck the string when the hammer 1070 returns with a repulsive force.

  A damper rail 1080 extending in the direction of the front of the entire action extends behind the key K, and a damper assembly 1081 is attached to each key. As the damper lever 1083 rotates, the damper 1082 moves away from the string when the key is pressed, and touches the string when the key is released to suppress the vibration.

  A regulating rail 1091 extends below the shank rail 1100, and a regulating button 1090 is screwed into each of the keys to extend downward. The regulating button 1090 abuts on the short piece 1043 of the jack while the jack 1040 is raised when the key is depressed, and has a function of rotating the jack 1040 forward.

  This action operates as follows when a key is pressed. In the non-key-pressed state, the wipen 1030 is at the lowest position, the hammer shank 1071 is supported by the hammer shank stop felt 1033, and the jack 1040 is positioned immediately below the hammer roller 1074. As the key is pressed, the pen 1030 is raised and the jack 1040 rotates the hammer roller 1074 and the hammer 1070. The jack 1040 is pushed forward to a position where the short piece 1043 comes into contact with the regulating button 1090, and thus the jack 1040 is released from the hammer roller 1074. Immediately after that, the key depression is in a full stroke state. With this separation, the hammer 1070 enters an escapement state that advances due to inertia and performs string striking. After striking the string, the hammer 1070 is rapidly returned by the repulsive force of the string and is received by the back check 1060, and the return of the hammer 1070 is stopped.

  The outline of the basic configuration of the action is as described above, and the description of the configuration not directly related to the function of the present invention is omitted. The grand piano type action shown in FIG. 3 includes a position switching mechanism 1200 that switches the position of the shank rail 1100 and a key load mechanism 1300 provided for each key.

  The position switching mechanism 1200 includes an operation unit 1210 attached to the piano body, and a drive unit 1220 that displaces the hammer shank 1071 in the hitting direction based on the operation of the operation unit 1210.

  The drive unit 1220 includes a support shaft 1221 that extends in the frontage direction of the entire action and is supported by the bracket 1010 at both ends, and a lifter 1222 that is rotatably supported by the support shaft and extends in the frontage direction. The support shaft 1221 and the lifter 1222 are positioned immediately below the hammer shank 1071 in the normal state (the state before sound attenuation), and the lifter 1222 extends rearward from the support shaft 1221 along the inclination of the hammer shank 1071. Yes.

  FIG. 5 is a perspective view showing the position switching mechanism 1200 taken out. As illustrated, the drive unit 1220 of the position switching mechanism 1200 includes a motor 1223, and the operation unit 1210 includes a control mechanism 1211 that rotates the motor at a predetermined angle, and a switch 1212 that operates the control mechanism. . The motor 1223 is connected to the support shaft 1221 and drives the support shaft 1221 by a predetermined angle according to the operation of the switch 1212. That is, when the switch 1212 is turned on, the control mechanism 1211 rotates the motor 1223, and the support shaft 1221 is rotated by the rotation of the switch 1222, and the lifter 1222 is moved from the position indicated by the one-dot chain line in FIGS. It lifts to the position shown, and the control mechanism 1211 stops the motor 1223 in this state. The tip surface of the lifter 1222 is covered with a soft member 1222a (felt, rubber, etc.) for buffering when contacting the hammer shank 1071. Also, by turning off the switch 1212, the control mechanism 1211 rotates the motor 1223 in the reverse direction, and the rotation accompanying this rotates the support shaft 1221 to the original position, and the control mechanism 1211 stops the motor 1223 in this state. The switch 1212 and the control mechanism 1211 of the operation unit 1210 are mounted on the shelf plate T that supports the action.

  The key load mechanism 1300 includes a leaf spring 1301 having one end coupled to the lifter 1222 and the other end contacting the upper surface of the repetition lever flange 1051. The leaf spring 1301 is coupled to the lifter 1222 and is supported by the bracket 1010 via the support shaft 1221, and holds the position against the elastic reaction force of the leaf spring 1301. Thereby, the leaf spring 1301 applies a spring force so as to push down the upper surface of the repetition lever flange 1051.

  This grand piano type action operates as follows. During normal performance, the switch 1212 is turned off as shown. As a result, the lifter 1222 and the hammer shank 1071 are held at positions away from the string S by a normal distance (the chain line portion in FIGS. 3 and 4). Next, the switch 1212 is turned ON during performance with weak sounds. As a result, the motor 1223 rotates to rotate the lifter 1222 upward, and the hammer shank 1071 and the hammer 1070 come close to the string S (solid line portions in FIGS. 3 and 4). When the key is depressed, the hammer shank 1071 and the hammer 1070 are rotated from this position to strike a string (the broken line portion in FIGS. 3 and 4). As described above, the hammer 1070 starts to rotate from a position close to the string S, so that it is possible to perform with a weak sound.

  In this attenuated state, the hammer shank 1071 is separated from the jack 1040. As a result, the weight of the member such as the wiper 1030 coupled to the jack 1040 does not act on the key pressing state, and the key pressing resistance is extremely small as it is. ”State. On the other hand, in the present embodiment, in the non-key-pressed state, the leaf spring 1301 (elastic member) of the key load mechanism 1300 biases the repetition lever flange 1051 in a downward direction (see FIGS. 3 and 4). Position shown as spring 1301). When the key is depressed, the lifter 1222, the wiper 1030, the repetition lever 1050, the repetition lever flange 1051 and the like are lifted against the biasing force, and the jack 1040 reaches a position where it contacts the hammer roller 1074. It will be lifted (position shown as leaf spring 1301 ′ in FIGS. 3 and 4). At this time, since the support shaft 1221 does not rotate due to the position holding action of the motor shaft, the lifter 1222 also does not rotate. Accordingly, the leaf spring 1301 maintains the position of the support end on the lifter 1222 side, and is pushed up the contact side with the repetition lever flange 1051 while being elastically deformed. The force for performing this push-up becomes a key-pressing resistance, and an “empty” state at the time of key pressing is avoided.

  Thus, in the grand piano type action according to the present embodiment, the hammer 1070 and the hammer 1070 are lifted by the position switching mechanism 1200, and the hammer 1070 starts to rotate from the position approaching the string S. Performance is performed effectively. At the same time, in the key load mechanism 1300, while the jack 1040 that is separated from the repetition lever 1050 reaches the repetition lever 1050 when the key is pressed, the leaf spring 1301 (elastic member) gives the key pressing resistance, and the “empty” state is obtained. Because it avoids, touch feeling is not spoiled.

  As mentioned above, this invention is not limited to the said embodiment, A various change is possible unless it deviates from the meaning. For example, the lifter 1222 of the position switching mechanism 1200 for the grand piano type action can have a shape extending long along the hammer shank 1071 as shown in FIG. Thereby, even if the rotation angle of the lifter 1222 is small, the hammer shank 1071 can be lifted by a necessary distance. As a result, the load on the leaf spring 1301 can be small.

  Further, the key load mechanism 1300 may be provided with an elastic member that applies an elastic force to the key K toward the non-key-pressed position, similar to the one shown in FIG. That is, as shown in FIG. 7, the base end portion of the leaf spring 1231 (elastic member) is fixed to the rotating shaft 1233 supported by the support member 1232 supported by a shelf plate or the like, and the distal end portion of the leaf spring 1231 is fixed. It arrange | positions so that it may urge in the direction which pushes down the upper surface of a key. The rotation shaft 1233 is connected to the motor 1223 of the drive unit 1220, and is a mechanism that rotates the motor at a predetermined angle by the control mechanism 1211 and the switch 1212 of the operation unit 1210 to switch the presence / absence of the pressing force. This mechanism is the same as that shown in FIG.

  If the action is for an upright or grand piano type electronic piano, as described above, the string is replaced with a stopper member such as a metal plate, and the hammer and hammer shank hit the stopper member. In this case, the hammer is rotated from the position close to the stopper member by the operation of the position switching mechanism. By starting, the rotation speed of the swinging member immediately before the hit is lowered than usual, and the performance with a weak sound is effectively performed. In addition, the key load mechanism does not impair the touch feeling because the elastic member provides key pressing resistance as in the case of an acoustic piano action.

  The elastic member (leaf spring) of the key load mechanism minimizes the elastic coefficient (spring constant), adjusts the strength and position appropriately, and acts on the key, thereby effectively preventing an increase in load due to the key pressing depth. It becomes possible. The same effect can be obtained by adding a weight to the key in addition to or instead of the elastic member.

70: Hammer (oscillating member), 71: Hammer shank (oscillating member), 100: Hammer rail (bearing rail), 200, 200a: Position switching mechanism, 210: Operation unit, 220: Drive unit, 251: Motor ( Drive unit), 252: control mechanism (operation unit), 253: switch (operation unit), 300: key load mechanism, 310: shaft support unit (support unit) 320: leaf spring (elastic member), 1050: repetition lever, 1051: Repetition lever flange, 1070: Hammer (oscillating member), 1071: Hammer shank (oscillating member), 1200: Position switching mechanism, 1210: Operation unit, 1220: Drive unit, 1222: Lifter (drive unit), 1223 : Motor (drive unit), 1211: Control mechanism (operation unit), 12 12: Switch (operation unit), 1300: Key load mechanism, 1301: Leaf spring, K: Key

Claims (8)

In the upright piano type action in which the rocking member held on the support rail at the time of non-key press rotates in the hitting direction in conjunction with the key press,
A position switching mechanism coupled to the support rail, and a key load mechanism provided for each key;
The position switching mechanism includes an operation unit mounted on the piano body, and a drive unit coupled to the operation unit and the support rail to displace the support rail in the hitting direction based on the operation of the operation unit.
The key load mechanism includes an elastic member that applies an elastic force to the key toward a non-pressed position, and a support portion that is supported by the action or a neighboring member of the action so as to support the elastic member and resist an elastic reaction force. Upright piano type action characterized by having.   The upright piano type action according to claim 1, wherein the drive unit includes a link mechanism having one end coupled to the support rail, and the other end of the link mechanism is coupled to the operation unit. .   The drive unit is a motor connected to rotate the support rail, and the operation unit includes a control mechanism for rotating the motor at a predetermined angle and a switch for operating the control mechanism. The upright piano type action according to claim 1.   The upright piano type action according to any one of claims 1 to 3, wherein the elastic member is a spring having one end coupled to a stationary member in the action and the other end contacting a key. In the grand piano type action in which the rocking member held by the repetition lever rotates in the hitting direction in conjunction with the key depression when not depressed
A position switching mechanism for switching the position of the swing member, and a key load mechanism provided for each key,
The position switching mechanism includes an operation unit attached to the piano main body, and a drive unit coupled to the operation unit to contact the swing member and displace the swing member in the hitting direction based on the operation of the operation unit. And
The key load mechanism includes an elastic member that applies an elastic force toward the non-key-pressing position to the repetition lever flange or key, and an action or an adjacent member of the action so as to support the elastic member and resist an elastic reaction force. A grand piano type action characterized by comprising a supported part.   6. The grand piano type action according to claim 5, wherein the drive unit includes a link mechanism that is brought into contact with the swinging member at one end, and the other end of the link mechanism is coupled to the operation unit.   The drive unit is a motor connected to rotate the swing member, and the operation unit includes a control mechanism for rotating the motor at a predetermined angle and a switch for operating the control mechanism. The grand piano type action according to claim 5, wherein:   The ground according to any one of claims 5 to 7, wherein the elastic member is a spring having one end coupled to a stationary member in action and the other end contacting the repetition lever, the repetition lever flange, or the key. Piano type action.

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